VM4.2: Workaround for broken VM model

VirtueMartModelState::getStates and VirtueMartModelCountry::getCountries changes the internal cache ->_data, but does NOT modify ->_id...
The proper fix would be in VM's model classes to set the id to -1.

However, as a workaround we can call setId twice to ensure the cache is always invalidated and getData returns the proper object